I think part of our disagreement is stemming from a different take on the current status of American power. I believe we are weaker now than at any point in my lifetime (1979-present).
You can thank Bush for invading Iraq. The war in Iraq only exposes US military weakness and limit its ability to fight a war against China. This is why China is becoming ever so assertive against the US. The US must conclude the Iraq War as soon as possible to regroup and confront the PRC in the Pacific. In my opinion, the biggest threat to the US, economically and militarily, is the PRC.
Japan of all places is distancing themselves from us, our economy is in a shambles, our government IS printing money and on the verge of banana republic status, the bulk of our land forces are employed in two endless war, our aircraft are aging, we've spent most of the last ten years pissing in the faces of our European allies(except Poland...oh wait), AND we've allowed China to continue their unfair trade and monetary policies with us even encouraging the transfer of a huge percentage of our manufacturing base to the east.
When and if China decides to "incorporate" Taiwan will entirely hinge on their own interests and not some empty threat from us.
Before we continue bashing the PRC here, let's not forget that a lot of people are benefitting from trading with the PRC. How else you think Walmart is able to sell things so cheaply? Let's face it, we all like to bash the PRC for its unfair trading practicies with the rest of the world, but at the same time, we like to take advantage of them for their cheap labour to manufacture the shit that we all like to buy. Isn't that unfair? Let's face we stop trading with China altogether, then we can forget about buying anything for "cheap" in the future unless Americans are willing to work for less, which they won't.
Japan may be trying to get closer to China, but in time, they'll realize that the US is its only indispensable ally. Don't forget, Japan and China have territorial disputes in the Pacific. Not to mention, they clash over interpretations of history. They don't share the same ideals and values that Japan and the US does. Only the US can guarantee Japan's security and the Japanese knows it.